Muffler device



Jan. 19, 1965 P. J. CONLIN 3,166,152

MUFFLER DEVICE Fil ed Dec. 4. 1961 INVENTOR.

United States Patent Ofiice 3,166,152 Patented Jan. 19, 1965 3,166,152MUFFLER DEVICE Patrick J. Conlin, 1770 Davie St Vancouver, BritishColumbia, Canada Fined Dec. 4, 1961, Ser. No. 156,584 3 Claims. (Cl.181-58) This invention relates to mufflers for the exhaust of internalcombustion engines and more particularly to an improved designcharacterized by the utilization of the individual pulsations of theexhaust gases as the means for effecting the silencing or mufiling ofthe exhaust.

The principal object of the invention is to provide a mufiler forinternal combustion engine exhaust in which each individual pulsation isdivided into two parts and the two parts caused to oppose one anotherwith resultant canceling out of each other and consequent substantialelimination of noise.

Another object of the invention is to provide a muffler for the exhaustgases of an internal combustion engine characterized by small size,simple construction, and having passages for the exhaust gases soarranged as to cause a minimum of back pressure on the engine exhaustsystem.

With the foregoing objects in view, together with such adidtionalobjects and advantages as may subsequently appear, the invention residesin the parts, and in the construction, combination and arrangement ofparts described, by way of example, in the following specification of apresently preferred embodiment of the invention, reference being had tothe accompanying drawings which form a part of said specification and inwhich drawings:

FIG. 1 is a side elevational view of the muffler embodying the inventionas viewed in the direction of the entrance of gases into the inlet portor pipe of the mufiier.

FIG. 2 is an end elevational view as viewed from the right hand orexhaust end of a muffier, having reference to FIG. 1,

FIG. 3 is a top plan view of the muffler shown in FIG. 1 and havingreference to the position of the mufiier shown in FIG. 1,

FIG. 4 is a medial sectional view taken on the line 44 of FIG. 2,

FIGS. 5 and 6 are, respectively, medial sectional and transversesectional views taken on the lines 55 and 66 of FIG. 1, and

FIG. 7 is a perspective, fragmentary view of the end of the exhaust ordischarge pipe of the mufiler which is concealed within the mufilerbody.

Referring to the drawings, the illustrated embodiment of the inventioncomprises a body 1 having a cylindrical portion 2 preferably of greaterdiameter than length and having a flat end plate 3 closing one endthereof and a frusto-conical end portion 4 of approximately the sameaxial length as the cylindrical portion 2 closing the other end thereof.Any desired and convenient form of manufacture of the body may beemployed. The cylindrical portion 2, end plate 3 and frusto-conicalportion 4 may first be formed separately and welded together or thecylindrical portion 2 may be formed integrally with either of the otherportions and then united to the remaining portion by a single line ofwelding as may be most expedient. Still further, one-half of thecylindrical portion 2 may be formed integrally with the frusto-conicalportion 4 and the other half with the end plate 3 with the meeting edgesthereof each cut away to form an entrance for the inlet pipe 5.

The inlet pipe 5 projects from the muffler body and is attachable to thepipe carrying the engine exhaust and the pipe 5 enters and is welded tothe side of the cylindrical portion 2 with the side of said pipe removedfrom the axial center line of the mufiler body disposed substantiallytangentially thereto. An exhaust pipe 6 extends in the said axial linethrough the end plate 3 to which it is welded and has the inner andthereof cut away at opposite sides as at 7, 7 to form oppositelydisposed side openings separated by oppositely disposed tongues 8, 8which are welded to the inner face of the end portion 5 at the smallerend thereof.

The exhaust gases entering the mufiler body through the tangentiallydisposed inlet pipe 5 are caused to move circularly about the interiorof the body and at increasing rotational speeds as they travel along thedecreasing diameter of the frusto-conical end portion 4. This increasingspeed of rotation serves in part to cause the successive pulsations ofthe exhaust to damp or cancel each other out since they are not insynchronism. Finally, each such pulsation must enter the exhaust pipe 6at the opposed openings'therein and the result is that since they areequal both in-timing and in the force exerted, they cancel each otherout resulting in a substantially noiseless exhaust. It is to beparticularly noted that the muffler contains no baflle means or otherobstruction to the free flow of the exhaust gases through the device.Therefore, assuming a muflier having pipes at least equal in size to thepipe leading from the engine exhaust to which the mufller is attached,the back pressure produced by the mufilenper se, is reduced to aminimum.

While in the foregoing specification, there has been disclosed apresently preferred embodiment of the invention, the invention is not tobe deemed to be limited to the precise details of construction thusdisclosed by way of example, and it will be understood that theinvention includes as well all such changes and modifications in theparts, and in the construction, combination and arrangement of parts asshall come within the purview of the appended claims.

I claim:

1. A muffier device for the exhaust of an internal combustion enginecomprising a hollow, cylindrical body having a circular side wall,

a first end wall comprising a fiat plate at one end of said side wall,and a frusto-conical portion closing the opposite end of said side Wall,

an inlet pipe extending through said side wall disposed substantiallytangentially thereto operative to conduct received exhaust gases intosaid body,

and an exhaust pipe extending through said first named end wall in theaxial line of said body operative to conduct exhaust gases from saidbody;

said exhaust pipe within said body being attached to the inner face ofsaid frusto-conical portion and having a pair of laterally opposite sideopenings adjacent to said frusto-conical portion through which theexhaust gases enter said exhaust pipe.

2. A muflier device as claimed in claim 1 in which said side wallthrough which said exhaust pipe extends is References Cited in the fileof this patent UNITED STATES PATENTS Buckwalter Sept. 18, Chipley Sept.7, Will-as July 19, Johnston May 22, Chipley Apr. 12,

FOREIGN PATENTS France June 8,

1. A MUFFLER DEVICE FOR THE EXHAUST OF AN INTERNAL COMBUSTION ENGINECOMPRISING A HOLLOW, A CYLINDRICAL BODY HAVING A CIRCULAR SIDE WALL, AFIRST END WALL COMPRISING A FLAT PLATE AT ONE END OF SAID SIDE WALL, ANDA FRUSTO-CONICAL PORTION CLOSING THE OPPOSITE END OF SAID SIDE WALL, ANINLET PIPE EXTENDING THROUGH SAID SIDE WALL DISPOSED SUBSTANTIALLYTANGENTIALLY THERETO OPERATIVE TO CONDUCT RECEIVED EXHAUST GASES INTOSAID BODY,